package com.example.skycode6.dao;

import com.example.skycode6.bean.NoticeBean;
import com.example.skycode6.util.DBConnection;

import java.sql.*;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class NoticeDao {
DBConnection DBConn = new DBConnection();
//todo 完成增删改查功能
public List<NoticeBean> getList(int page) {
Connection conn = DBConn.getConn();
String sql = "select * from notice limit "+(page-1)*10+",10";
List<NoticeBean> list = new ArrayList<>();
try {
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(sql);
while (rs.next()) {
NoticeBean noticeBean = new NoticeBean();
noticeBean.setNoticeID(rs.getInt("NoticeID"));
noticeBean.setNoticeTitle(rs.getString("NoticeTitle"));
noticeBean.setNoticeContent(rs.getString("NoticeContent"));
noticeBean.setNoticeTime(rs.getString("NoticeTime"));
noticeBean.setAdminName(rs.getString("AdminName"));
list.add(noticeBean);
}
} catch (SQLException e) {
throw new RuntimeException(e);
}
return list;
}

/**
* @param noticeBean 传入要更新的新闻对象,必须包含新闻id值
* @return 收影响行数
*/
public int update(NoticeBean noticeBean) {
Connection conn = DBConn.getConn();
if (noticeBean.getNoticeID() > 0) {
try {
Statement stmt = conn.createStatement();
String sql = "update notice set NamesTitle='" + noticeBean.getNoticeTitle() + "'"
+ ",NoticeContent+'" + noticeBean.getNoticeContent() + "'"
+ ",NoticeTime='" + (new Date()).toString() + "'"//更新时使用当前系统时间
+ ",AdminName='" + "假管理员" + "'"//todo使用添加的管理员名称
+"where NoticeID='"+noticeBean.getNoticeID()+"'";
return stmt.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
}
return 0;
}
return 0;
}

public int add(NoticeBean noticeBean) {
Connection conn = DBConn.getConn();
try {//使用预处理执行插入
String sql = "insert into notice(NoticeTitle,NoticeContent,NoticeTime,AdminName) values(?,?,?,?)";
PreparedStatement pmst = conn.prepareStatement(sql);
pmst.setString(1,noticeBean.getNoticeTitle());//将第一个参数设置为标题内容
pmst.setString(2,noticeBean.getNoticeContent());
pmst.setString(3,(new Date()).toString());
pmst.setString(4,"临时管理员");
return pmst.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
}
return 0;
}
/**
* 删除功能
*/
public int deleteNewsByNewsID(int noticeID) {
Connection conn = DBConn.getConn();
String sql = "delete from notice where NoticeID=?";
try {
PreparedStatement pmst = conn.prepareStatement(sql);
pmst.setInt(1,noticeID);
return pmst.executeUpdate();
} catch (SQLException e) {

}
return 0;
}
public int countPage(){
Connection conn = DBConn.getConn();
String sql = "select count(*) from notice";
try {
Statement statement = conn.createStatement();
ResultSet rs = statement.executeQuery(sql);//获取查询结果集
if (rs.next()) {
return (rs.getInt(1)/10) +1;
}
} catch (SQLException e) {
throw new RuntimeException(e);
}
return 0;
}
}